<template>
  <div class="upload-file">
    <el-upload multiple :action="uploadFileUrl" :before-upload="handleBeforeUpload" :file-list="fileList"
      :limit="props.limit" :on-error="handleUploadError" :on-exceed="handleExceed" :on-success="handleUploadSuccess"
      :show-file-list="false" style="margin-bottom: 2px;" :headers="headers" class="upload-file-uploader" ref="fileUpload"
      v-if="display && fileList.length !== props.limit" :data="getData">
      <!-- 上传按钮 -->
      <el-button type="success">选取文件</el-button>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="display && showTip && fileList.length !== props.limit"
      style="height: 15px;line-height:15px;margin-top:0;position: absolute;">
      请上传
      <template v-if="fileSize">
        大小不超过
        <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为
        <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>
    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul"
      :style="'margin-top:' + (fileList.length == props.limit ? '0' : '20px')">
      <li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content pointer"
        v-for="(file, index) in fileList">
        <span class="el-icon-document" @click="clickDownLoad(file.fileId, file.fileName)">{{ file.fileName }}({{
          file.fileSizeDisplay }})</span>
        <div class="ele-upload-list__item-content-action" v-if="display" style="margin-left: 10px;">
          <el-link :underline="false" @click="handleDelete(index)" type="danger">
            <el-icon>
              <CircleClose />
            </el-icon>
          </el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 数量限制
  limit: {
    type: Number,
    default: 1,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 100,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["doc", "docx", "xls", "xlsx", "ppt", "txt", "pdf"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
  // 是否显示选择按钮
  isDisplay: {
    type: Boolean,
    default: true,
  },
  typeId: {
    type: Number,
  },
  groupId: {
    type: String,
  },
  autoUpload: {
    type: Boolean,
    default: false,
  },
  isLocal: {
    type: Boolean,
    default: true,
  },
  fileId: {
    type: String,
  },
  authId: {
    type: Number,
  }
});

const { proxy } = getCurrentInstance();
const emit = defineEmits(["upOver"]);
const number = ref(0);
const uploadList = ref([]);
const uploadFileUrl = ref(
  import.meta.env.VITE_APP_BASE_API +
  (props.autoUpload ? ("/system/file/autoUpload?fileId=" + (props.fileId ? props.fileId : "")) : "/system/file/upload?authId=" + (props.authId ? 1 : ''))
); // 上传文件服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([{}]);
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
);

const display = computed(() => props.isDisplay);

watch(
  () => props.modelValue,
  (val) => {
    if (val) {
      let temp = 1;
      // 首先将值转为数组
      const list = Array.isArray(val) ? val : props.modelValue.split(",");
      // 然后将数组转为对象数组
      fileList.value = list.map((item) => {
        if (typeof item === "string") {
          item = { name: item, url: item };
        }
        item.uid = item.fileId || new Date().getTime() + temp++;
        return item;
      });
    } else {
      fileList.value = [];
      return [];
    }
  },
  { deep: true, immediate: true }
);

// 上传前校检格式和大小
function handleBeforeUpload(file) {
  uploadFileUrl.value = import.meta.env.VITE_APP_BASE_API + (props.autoUpload ? ("/system/file/autoUpload?fileId=" + (props.fileId ? props.fileId : "")) : "/system/file/upload?authId=" + (props.authId ? 1 : ''))
  // 校检文件类型
  if (props.fileType.length) {
    const fileName = file.name.split(".");
    const fileExt = fileName[fileName.length - 1];
    const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
    if (!isTypeOk) {
      proxy.$modal.msgError(
        `文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`
      );
      return false;
    }
  }

  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传文件，请稍候...");
  number.value++;
  return true;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError(err) {
  proxy.$modal.msgError("上传文件失败");
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    emit("upOver", res.data);
    uploadList.value.push({
      fileName: res.data.fileName,
      fileId: res.data.fileId,
      fileSizeDisplay: res.data.fileSizeDisplay,
    });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.fileUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除文件
function handleDelete(index) {
  fileList.value.splice(index, 1);
  emit("update:modelValue", fileList.value);
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", fileList.value);
    proxy.$modal.closeLoading();
  }
}

function getData() {
  let values = {};
  if (props.typeId) {
    values.typeId = props.typeId;
  }
  if (props.groupId) {
    values.groupId = props.groupId;
  }
  return values;
}

async function clickDownLoad(fileId, fileName) {
  proxy.$modal.loading("正在下载文件，请稍候...");
  if (props.isLocal) {
    proxy.$download
      .localFile(fileId, fileName)
      .then((resp) => {
        proxy.$modal.closeLoading();
      })
      .catch((res) => {
        proxy.$modal.closeLoading();
      });
  } else {
    proxy.$download
      .file(fileId, fileName)
      .then((resp) => {
        proxy.$modal.closeLoading();
      })
      .catch((res) => {
        proxy.$modal.closeLoading();
      });
  }
}
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
  border: 0px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}

.pointer {
  cursor: pointer;
}

.el-upload-list {
  margin: 0px;
}
</style>
